Sorry, but I couldn't find any documentation to overclock the miner based on what I searched on Google you need to flash the unit with custom firmware meaning you are going to use other firmware than the stock firmware.
And it seems I can't find any free overclock firmware for this unit. Some of the sites mentioned in the guide that I found on Google is not a well-known company I can't just recommend them but I found one site that sells this overclocked firmware for m30 and I think you can ask them if how does this firmware work or ask them what PSU are compatible to your unit once you flash the unit with their overclocked firmware.
Here's the link https://www.zeusbtc.com/ASIC-Miner-Repair/Parts-Tools-Details.asp?ID=2483